Half to thomas b



(No Model.)

. G. P. GALLAGHER.

FURNACE.

Patented Oct. 16, 1888-.

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STATES PATENT Fries,

GEORGE F. GALLAGHER, OF ROCHESTER, NEW YORK, ASSIGNOR OF ONE- HALF TO THOMAS E. MOORE, OF SAME PLACE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 391,310, dated October 16, 1888.

A Application filed May 12, 1888. Serial No 273.685. (No model.)

To aZZ whom it may concern.-

Be it known that I, GEORGE F. GALLAGHER, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apperta-ins to make and use the same, reference being had to the accompanying drawings, and to letters or figuresofret'ereuce marked thereon, which form a part of this specification.

Myinvention relates to that class of furnaces which have for their object the entire consumption of all the products of combustion; and it consistsin certain improvements in that special class in which the draft is downward through the fuel and grate-bars, all of which will be fullyhereinafter described and claimed.

In the drawings, Figure 1 is a vertical longitudinal section of my improved furnace shown in connection with a boiler. Fig. 2 is a partial front view of the same, and Fig. 3 is a horizontal section taken in the line a: x of Fig. 2.

Referring to the drawings, a, is the boiler, under the front end of which is located the furnace, of which 11 is the firebox, b the ashpit, and b the grate-bars. The bridge-wall c, as will be seen, is solid above the grate-bars, thus closing in the. firebox at the rear, and has an opening, 0, in its lower portion leading from the ash-pit.

d is the door of the fire-box with damper d, and e e are the ash-pit doors with their dampers c e.

To the construction thus far described as a basis, and for which I do not claim any novelty, I propose to add my improved features, thus producing a most effective apparatus for the purpose desired. I accordingly arrange, by preference, two chambers or passages, f and g, above the grate-bars,the higher chamber, f, commencing at the front of the furnace on the left-hand side, with the door f in the front wall of the furnace,by which the draft through this passage can be regulated. This passage extends back along the side wall of the firebox, thence across the rear wall and forward along the other side wall, with the openingf leading into the fire-box at the front. A damper, f, is placed in the door f. The other chamber or passage,g,com mences at the door y, with damper g on the right-hand side, and extends back just over the grate-bars along the right-hand side wall of the ash-pit; thence across the rear wall and forward along the other side wall, with the opening g (see Fig. 1) leading into the fire-box at the front.

In this connection I would state that while I have preferably shown only two of these passages the entire side and rear walls of the fire-box could be lined with a series of them, or the passages could extend only along the side walls, in which event each separate chamher would have a return-passage to conduct the air to the rear of the fire-box and return it to the front, to be discharged into the firebox at that point, as in the construction shown in the drawings.

The operation of my improved furnace is substantially as follows: Without the chambers or passagesf and g the draft would be admitted through the door d of the fire-box and would pass down through the fuel and gratebars into the ash-pit and from thence through opening 0' in its heated state through the flues of the boiler. \Vith my improved construc tion I close the door (I and its damper d and open the side doors, f and g, which admits a current of air to the chambers f and g. This air becomes superheated in its passage around the fire-box and is discharged at the front and drawn in this condition down through the fuel and grate-bars. Being superheated, as before stated, it causes a complete consumption of all the products of combustion, thus effecting the purpose desired.

I am aware of the use of the hollow gratebars through which the draft is conducted, and also of a construction by means of which the draft is conducted up through a chamber at the back of the fire-box and discharged into the same at that point for its passage through the fuel and grate-bars in a downward direction; but in my improved construction the air is conducted to the rear of the fire-box and returned and discharged into the same in a su- IOO 5 thorough consumption of the products of combustion than in the furnaces now in use, where the draft passes down through the fuel and grate-bars.

This form of furnace is obviously adapted IO for other purposes than that of steam-generating. With thisimproved construction the superheated air will necessarily pass slowly through the furnace, but will cause a correspondinglyintenser heat in the firebox, as

15 the air already superheated will be more or less confined, thereby causing a greater but" much slower combustion.

I claimi 1. A furnace for steam-generating and other 20 purposes, consisting, essentially, of a fire-box with closed side and rear walls, an ash-pit with an opening for the discharge of the products of combustion, and air passages or chambers located in the fire-box above the grate'bars and adapted to conduct air from the outside to the rear of the fire-box and thence to the front of the same, where it is discharged in a superheated state for its downward passage through the fuel and grate-bars.

2. A furnace for steam-generating and other purposes, consisting of the vfire-box b, with closed side and rear walls, the ash-pit b, with rear opening, 0, the grate-bars b and the chambers or passages f and 9, located above the grate-bars and passing in opposite directions around the side and rear walls of the fire-pit, having openings in the furnace-front for the admission of air, and discharge-openings f and g in the front of the fire-box, all operating substantially as and for the purpose stated.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE F. GALLAGHER.

Witnesses:

W. T. MILLER, OTTO HODDIOK. 

